CN113394987A - Capacity-adjustable power supply equipment - Google Patents
Capacity-adjustable power supply equipment Download PDFInfo
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- CN113394987A CN113394987A CN202110609862.4A CN202110609862A CN113394987A CN 113394987 A CN113394987 A CN 113394987A CN 202110609862 A CN202110609862 A CN 202110609862A CN 113394987 A CN113394987 A CN 113394987A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application relates to a power supply unit with adjustable capacity, including: a variable frequency power supply, a transformer, a voltage regulating module and a resonance module, signal acquisition module and industrial computer, variable frequency power source connects the primary winding of transformer, external power source, with the industrial computer, the voltage regulation module is connected to the secondary winding of transformer, resonance module and industrial computer are connected to the voltage regulation module, resonance module connects the distribution transformer that awaits measuring, signal acquisition module connects resonance module and gathers resonance module's output voltage and send to the industrial computer, the industrial computer is used for adjusting resonance module's input voltage frequency and amplitude according to output voltage, the output voltage who makes resonance module satisfies the distribution transformer's that awaits measuring supply voltage, guarantee the normal operating of distribution transformer that awaits measuring when realizing that variable frequency power source capacity is less, when solving portable removal inspection vehicle and carrying out performance test to distribution transformer on-the-spot, the problem that leads to is difficult to satisfy power capacity, the convenience of test has been improved.
Description
Technical Field
The application relates to the field of large-capacity power equipment tests, in particular to power supply equipment with adjustable capacity.
Background
With the scale expansion of the smart power grid and the increasing load capacity, the distribution transformer becomes a foundation for supporting the power grid to transform voltage and current, plays an important role in the power transmission process, and is related to the normal life of residents and stable industrial production. In order to ensure the quality and reliable operation of the distribution transformer, performance test of the distribution transformer is indispensable.
However, due to the problems of troublesome equipment movement and detection efficiency, the performance of the distribution transformer is tested on site by adopting a portable mobile inspection vehicle in the current distribution transformer testing mode, so that a variable-frequency power supply with a large volume cannot be adopted, the problem that the capacity is not matched with the demand of the distribution transformer to be tested exists, and the demand of the distribution transformer to be tested on the power supply capacity is difficult to meet.
Disclosure of Invention
Based on this, it is necessary to provide a power supply device with adjustable capacity to solve the problem that the capacity of the power supply device does not match the requirement of the distribution transformer to be tested.
A capacity scalable power supply apparatus comprising: variable frequency power supply, transformer, voltage regulation module, resonance module, signal acquisition module and industrial computer, variable frequency power supply connects primary winding, external power source of transformer, with the industrial computer, the secondary winding of transformer is connected the voltage regulation module, the voltage regulation module is connected the resonance module with the industrial computer, resonance module connects the distribution transformer that awaits measuring, signal acquisition module connects resonance module with the industrial computer is used for gathering resonance module's output voltage with distribution transformer's that awaits measuring supply voltage's difference and send to the industrial computer, the industrial computer is used for adjusting resonance module's input voltage frequency and amplitude make the difference satisfies the threshold value requirement.
In one embodiment, the voltage regulating module comprises a rectifying circuit, a capacitor and a variable resistor, wherein the input side of the rectifying circuit is connected with the secondary winding of the transformer, the capacitor is connected in parallel with the output side of the rectifying circuit, the output side of the rectifying circuit is also connected with the first end and the second end of the variable resistor, the regulating end of the variable resistor is used as the positive electrode of the output side of the voltage regulating module, the positive electrode of the output side is connected with the industrial personal computer, and the second end of the variable resistor is used as the negative electrode of the output side of the voltage regulating module.
In one of them embodiment, the resonance module includes equivalent resistance, series reactor, shunt reactor and voltage divider, equivalent resistance one end is connected the output side positive pole of pressure regulating module, the other end of equivalent resistance is connected the one end of series reactor, the other end of series reactor is connected the one end of shunt reactor with the voltage divider, the other end of shunt reactor is connected the output side negative pole of pressure regulating module with the voltage divider, the voltage divider is connected the signal acquisition module with distribution transformer awaits measuring.
In one embodiment, the signal acquisition module includes a voltage acquisition circuit, a difference output circuit and a digital-to-analog conversion circuit, the voltage acquisition circuit is connected with the voltage divider and the difference output circuit, the difference output circuit is connected with the digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is connected with the industrial personal computer.
In one embodiment, the power supply equipment with the adjustable capacity further comprises a display module, and the display module is connected with the industrial personal computer.
In one embodiment, the signal acquisition module is connected with the resonance module through an optical fiber, and the industrial personal computer is connected with the display module through an optical fiber.
In one embodiment, the power supply device with adjustable capacity further comprises an auxiliary power supply, and the auxiliary power supply is connected with the external power supply, the industrial personal computer and the signal acquisition module.
In one embodiment, the power supply device with adjustable capacity further includes a power protection device and a device protection device, the external power source is connected to the variable frequency power source through the power protection device, and the resonance module is connected to the distribution transformer to be tested through the device protection device.
In one embodiment, the power supply equipment with adjustable capacity further comprises a voltage stabilizing device, and the variable-frequency power supply is connected with the transformer through the voltage stabilizing device.
In one embodiment, the variable frequency power supply is a high voltage digital power supply.
Above-mentioned capacity adjustable power supply unit through frequency and the amplitude of adjustment resonance module input voltage, under the condition that satisfies the resonance state, but realizes guaranteeing the normal operating of distribution transformer that awaits measuring when variable frequency power source capacity is less, when solving portable removal inspection vehicle and carrying out performance test to distribution transformer on-the-spot, the problem that is difficult to satisfy power capacity that leads to has improved the convenience of test.
Drawings
FIG. 1 is a system diagram of an embodiment of a power sourcing equipment with adjustable capacity;
FIG. 2 is a circuit topology diagram of a power supply apparatus in one embodiment;
FIG. 3 is a circuit diagram of a voltage regulation module in an embodiment;
FIG. 4 is an equivalent circuit diagram of a resonant module in one embodiment;
fig. 5 is a circuit diagram of a voltage regulator device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, as shown in fig. 1, there is provided a power supply apparatus with adjustable capacity, including: variable frequency power supply 110, transformer 120, voltage regulation module 130, resonance module 140, signal acquisition module 150 and industrial computer 160, variable frequency power supply 110 connects the primary winding of transformer 120, external power source and industrial computer 160, voltage regulation module 130 is connected to the secondary winding of transformer 120, voltage regulation module 130 connects resonance module 140 and industrial computer 160, resonance module 140 connects the distribution transformer that awaits measuring, signal acquisition module 150 connects resonance module 140 and industrial computer 160, be used for gathering resonance module 140's output voltage and the difference of the distribution transformer's that awaits measuring supply voltage and sending to industrial computer 160, industrial computer 160 is used for adjusting resonance module 140's input voltage frequency and amplitude, make the difference satisfy the threshold value requirement.
Specifically, the variable frequency power supply 110 is connected with an external 380V alternating current power frequency power supply, and outputs a pure sine wave after links such as rectification, filtering and inversion, and the frequency and amplitude of the output voltage of the variable frequency power supply are adjustable within a certain range. The type of the variable frequency power supply 110 is not exclusive, and a linear amplification type variable frequency power supply or an SPWM switching type variable frequency power supply may be used. In one embodiment, an SPWM switching-type variable frequency power supply is employed as the variable frequency power supply 110, which may be, for example, a high voltage digital power supply. The high-voltage digital power supply comprises a main circuit and a control circuit, wherein the main circuit comprises an AC-DC rectifying circuit, a DC-AC inverter circuit and a filter circuit, the control circuit is an SPWM control circuit connected with the industrial personal computer 160 and used for generating an SPWM control signal according to an instruction sent by the industrial personal computer 160 to adjust the frequency and the amplitude of the output voltage of the main circuit. After passing through the variable frequency power supply 110, the ac sine wave is input to the primary winding side of the transformer 120, and is rectified, filtered, and frequency-amplitude-adjusted.
Further, since the ac voltage output by the variable frequency power supply 110 may not meet the requirement of the supply voltage of the distribution transformer to be tested, the transformer 120 is configured to boost the ac voltage output by the variable frequency power supply 110 and send the boosted ac voltage to the voltage regulating module 130. As shown in fig. 2, the transformer 120 may be an excitation transformer T, and the excitation transformer T may provide a three-phase ac excitation power supply, so as to meet the requirement of the distribution transformer to be tested.
Further, considering that the secondary winding side of the transformer 110 may be connected with the resonance module 140 using a contact, it may be difficult to ensure that the input voltage of the resonance module 140 exhibits a linear variation. Therefore, in order to ensure that the frequency of the resonance module 140 meets the condition that the resonance module 140 reaches resonance and the amplitude of the output voltage of the resonance module 140 meets the supply voltage of the distribution transformer to be tested, the voltage regulating module 130 may be added between the transformer 110 and the resonance module 140 to realize the linear regulation of the input voltage of the resonance module 140 within a small range.
Further, the resonance module 140 is configured to generate resonance in the loop at a certain frequency of the input voltage, so that the output voltage of the resonance module 140 is Q times of the input voltage, thereby achieving a purpose of supplying a large current to an external device from a small-capacity power supply. Wherein Q is a quality factor of the resonance module 140, i.e., a voltage resonance multiple, which is generally several tens to one hundred. The resonance module 140 includes a series resonance unit for generating a series resonance and outputting an output voltage Q times higher than an input voltage, and a parallel compensation unit for realizing energy exchange between a capacitor and a reactor of the resonance module 140, compensating a capacitive current of the distribution transformer to be measured, reducing a requirement on power of the transformer 110 and the resonance module 140, and improving a load carrying capacity.
Further, the signal acquisition module 150 is connected to the resonance module 140 and acquires an output voltage thereof, a difference between the output voltage of the resonance module 140 and a supply voltage of the distribution transformer to be measured is calculated, and the difference and the output voltage are transmitted to the industrial personal computer 160, and the industrial personal computer 160 adjusts the frequency and the amplitude of the input voltage of the resonance module 140 according to the difference and the output voltage, so that the resonance module 140 meets a series resonance and the difference meets a threshold requirement. The difference value satisfies the threshold requirement, and the determination method may be that the output voltage of the resonance module 140 is equal to the supply voltage of the distribution transformer to be tested, or that the difference value between the output voltage and the supply voltage is smaller than or equal to the threshold. The threshold value may be determined according to an allowable error range, a specific value is not unique, and may be set according to an actual situation, which is not limited in this embodiment. In addition, the frequency of the input voltage of the resonance module 140 is adjusted by the industrial personal computer 160 to adjust the variable frequency power supply 110, and the amplitude of the input voltage of the resonance module 140 is adjusted by the industrial personal computer 160 to adjust the variable frequency power supply 110 and the voltage regulating module 130 together.
Above-mentioned capacity adjustable power supply unit can realize guaranteeing the distribution transformer's that awaits measuring normal operating when variable frequency power supply capacity is less, when solving portable removal inspection car and carrying out capability test to distribution transformer on-the-spot, the problem that is difficult to satisfy power capacity that leads to has improved the convenience of test.
In one embodiment, as shown in fig. 3, the voltage regulating module 130 includes a rectifying circuit 131, a capacitor C and a variable resistor R, an input side of the rectifying circuit 131 is connected to the secondary winding of the transformer 110, the capacitor C is connected in parallel to an output side of the rectifying circuit 131, an output side of the rectifying circuit 131 is further connected to a first end and a second end of the variable resistor R, a regulating end of the variable resistor R serves as an output side positive electrode of the voltage regulating module 130, the output side positive electrode is connected to an industrial personal computer, and the second end of the variable resistor R serves as an output side negative electrode of the voltage regulating module.
Specifically, the rectifier circuit 131 is a full-bridge rectifier circuit, and includes four diodes connected end to end: diode D1, diode D2, diode D3, and diode D4. The anode of the diode D1 is connected to the cathode of the diode D3, the anode of the diode D2 is connected to the cathode of the diode D4, the cathode of the diode D1 is connected to the cathode of the diode D2, and the anode of the diode D3 is connected to the anode of the diode D4. A common connection point of the diode D1 and the diode D3 serves as a first input pole on the ac side, and a common connection point of the diode D2 and the diode D4 serves as a second input pole on the ac side. The common connection point of the diode D1 and the diode D2 serves as an output anode, and the common connection point of the diode D3 and the diode D4 serves as an output cathode.
Further, the first input pole and the second input pole of the rectifying circuit 131 are connected to two ends of the secondary winding of the transformer 110, so as to obtain an ac sine wave which is subjected to rectification filtering and frequency amplitude adjustment output by the boosted variable frequency power supply 110. The capacitor C is connected in parallel to the output positive electrode and the output negative electrode of the rectifying circuit 131 to play a role of voltage stabilization and filtering, the output positive electrode and the output negative electrode of the rectifying circuit 131 are further connected to the first end and the second end of the variable resistor R, and the voltage at the two ends of the secondary winding of the transformer 110 is equal to the voltage at the first end and the second end of the variable resistor R. The adjustment terminal of the variable resistor R serves as the output-side positive electrode of the voltage adjustment module 130, and the second terminal of the variable resistor R serves as the output-side negative electrode of the voltage adjustment module, and is connected to and inputs a voltage to the resonance module 140. The adjusting end of the variable resistor R is further connected with the industrial personal computer 160 to linearly slide the variable resistor R to realize linear control of the input voltage of the resonance module 140.
In the present embodiment, the voltage regulating module 130 is added to realize that the input voltage of the resonance module 140 is linearly regulated within a small range.
In one embodiment, as shown in fig. 2, the resonance module 140 includes an equivalent resistor R1, a series reactor L1, a shunt reactor L2, and a voltage divider, one end of the equivalent resistor R1 is connected to the positive electrode of the output side of the voltage regulating module 130, the other end of the equivalent resistor R1 is connected to one end of the series reactor L1, the other end of the series reactor L1 is connected to one end of the shunt reactor L2 and the voltage divider, the other end of the shunt reactor L2 is connected to the negative electrode of the output side of the voltage regulating module 130 and the voltage divider, and the voltage divider is connected to the signal acquisition module 150 and the distribution transformer to be tested.
Specifically, the test capacitance CX is used as the capacitance of the distribution transformer to be tested, and the test capacitance CX needs to be measured in order to make the voltage obtained by the distribution transformer to be tested reach the supply voltage. The voltage divider comprises a capacitor C1 and a capacitor C2, and the capacitor C1 and the capacitor C2 are connected with the test capacitance CX in parallel and used as a test device for the voltage of the test capacitance CX. The capacitor C1 is a high-voltage arm of the voltage divider, the capacitor C2 is a low-voltage arm of the voltage divider, and the signal acquisition module 150 accesses a common end of the capacitor C1 connected with the capacitor C2 to acquire a voltage value as voltage measurement and protection of the test capacitor CX. In addition, since the voltage divider is connected in parallel with the sample capacitor CX and is subject to the same voltage value, a capacitor having the same value as the rated voltage of the sample capacitor CX needs to be selected.
Further, the shunt reactor L2 is a parallel compensation unit, the shunt reactor L2 is connected in parallel with the voltage divider and the test capacitor CX, and the inductive current of the shunt reactor L2 is used for compensating the capacitive current of the test capacitor CX, so that the current flowing through the transformer and the series reactor L1 is reduced. As shown in fig. 4, which is an equivalent circuit diagram after the parallel compensation, the capacitor C0 is an equivalent capacitor obtained by connecting the voltage divider, the test capacitor CX, and the shunt reactor L2 in parallel.
Further, as shown in fig. 4, the series reactor L1 and the capacitor C0 are a series resonant unit, U0 is an output voltage after series resonance occurs, US is an output voltage of the voltage regulating module 130, and after the series reactor L1 and the capacitor C0 perform series resonance, the output voltage U0 is Q times higher than the input voltage US. The series reactor L1 is a high-voltage reactor, and the parameters are not unique, and may be composed of one high-voltage reactor or a plurality of high-voltage reactors.
The principle of parallel compensation of series resonance is explained below with reference to fig. 2 and 4, and when series resonance occurs, there are:
wherein ω is the frequency of the voltage output by the variable frequency power supply 110, and C0 is an equivalent capacitance obtained by connecting the voltage divider, the test capacitance CX, and the shunt reactor L2 in parallel.
And the following formula:
the voltage at two ends of the U0 test capacitance CX is the equivalent capacitance obtained by connecting the voltage divider and the test capacitance CX in parallel.
From equations (1) and (2), ω and the equivalent capacitance C0 can be obtained:
then, the quality factor Q of the parallel compensated series resonance is found to be:
therefore, the output voltage U0 is:
the main loop current I is:
from this, it can be seen that the output voltage U0 can be compensated by the shunt reactor L2, and the main loop current I can be reduced.
In the embodiment, the requirement on the capacity of the transformer and the reactor can be effectively reduced by a mode of parallel compensation series resonance, and the quality and the volume of test equipment can be reduced, so that the capacity matching with the distribution transformer to be tested is realized under the condition that the capacity and the current of the variable frequency capacitor are smaller.
In one embodiment, as shown in fig. 1, the signal acquisition module 150 includes a voltage acquisition circuit and a digital-to-analog conversion circuit, the voltage acquisition circuit is connected to the voltage divider and the digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is connected to the industrial personal computer.
Specifically, the voltage acquisition circuit comprises a voltage sensor and an adder. The voltage sensor can be a circuit structure for sampling voltage based on a mutual inductance principle or a voltage division principle, the voltage sensor obtains the output voltage of the voltage divider and then inputs the output voltage to one end of the adder, and the other end of the adder inputs the power supply voltage of the distribution transformer to be tested. The amplitude difference between the two is obtained by the adder, and is sent to the industrial personal computer 160 through the digital-to-analog conversion circuit together with the output voltage obtained by the voltage sensor.
In this embodiment, the signal acquisition module acquires a difference between the output voltage of the voltage divider and the power supply voltage of the distribution transformer to be tested and feeds the difference back to the industrial personal computer 160, so that the industrial personal computer 160 can adjust the frequency and the amplitude of the input voltage of the resonance module 140 according to the feedback value.
In one embodiment, as shown in fig. 1, the power supply device with adjustable capacity further includes a display module, and the display module is connected to the industrial personal computer 160.
Specifically, the display module is a display screen, and is connected to the industrial personal computer 160 for displaying the operating parameters of the industrial personal computer 160 and displaying the output voltage and the difference value fed back to the industrial personal computer 160 by the signal acquisition module 160. In one embodiment, the industrial personal computer 160 is further connected to peripheral devices such as a mouse and a keyboard for operating the display screen, and the display screen may also be a touch display screen and may be directly operated on the screen. In this embodiment, the operation and adjustment of the apparatus can be more conveniently performed by adding the display module.
In one embodiment, as shown in fig. 1, the signal acquisition module 160 is connected to the resonance module 140 through an optical fiber, and the industrial personal computer 160 is connected to the display module through an optical fiber. Specifically, the voltage sensor of the signal acquisition module 160 is connected with the voltage divider of the resonance module 140 through optical fibers, and the industrial personal computer 160 is connected with the display module through optical fibers, so that the communication quality is improved, and the anti-electromagnetic interference capability can be effectively improved under the high-voltage test scene.
In one embodiment, as shown in fig. 1, the power supply device with adjustable capacity further includes an auxiliary power supply, and the auxiliary power supply is connected to an external power supply, the industrial personal computer 160 and the signal acquisition module 150. Specifically, the input end of the auxiliary power supply is connected with an external 380V alternating current power frequency power supply to obtain power, and direct current is output to supply power to the industrial personal computer 160 and the signal acquisition module 150 after rectification, so that normal work of the industrial personal computer is guaranteed.
In one embodiment, as shown in fig. 1, the power supply equipment with adjustable capacity further includes a power protection device and an equipment protection device, the external power source is connected to the variable frequency power source 110 through the power protection device, and the resonance module 140 is connected to the distribution transformer to be tested through the equipment protection device.
Specifically, the power supply protection device and the equipment protection device are switching elements, and the equipment is used for supplying power to the distribution transformer, so that a high-voltage test is performed in a scene, and the external power supply, the tested device and the equipment need to be disconnected when the test is completed or the tested device is replaced. The power supply protection device and the equipment protection device can be manually opened and closed disconnecting link type switch elements, circuit breakers, air switches and other protection devices. In this embodiment, the power protection device and the equipment protection device are used as the obvious disconnection points between the equipment and the external power supply and the device to be tested, and play a role in protection under high voltage.
In one embodiment, as shown in fig. 5, the power supply apparatus with adjustable capacity further includes a voltage stabilizer, and the variable frequency power source 110 is connected to the transformer 120 through the voltage stabilizer.
Specifically, the voltage stabilizing device comprises a three-phase rectifier bridge, an inductor L3, an inductor L4, an inductor L5, a switch S1, a capacitor C4 and a diode D11, wherein three phases A, B and C of the variable frequency power supply are connected to the input side of the three-phase rectifier bridge through the inductor L3 and the inductor L4 and L5 respectively, the switch S1 is connected in parallel to the positive output end and the negative output end of the three-phase rectifier bridge, the positive output end of the three-phase rectifier bridge is connected to the positive electrode of the diode D11, one end of the capacitor C4 is connected to the negative electrode of the diode D11, the other end of the capacitor C4 is connected to the negative output end of the three-phase rectifier bridge, the negative electrode of the diode D11 is used as the positive output end of the voltage stabilizing device to be connected to one end of the primary winding of the transformer 120, and the negative output end of the three-phase rectifier bridge is used as the negative output end of the voltage stabilizing device to be connected to the other end of the primary winding of the transformer 120.
When the switch S1 is closed, the current of the inductor connected to the three phases starts to rise from zero and shows a linear change, and then the switch S1 is turned off, and the inductor current flows to the transformer 120 side through the diode D11 and rapidly drops to zero. In the rectification process of the voltage stabilizing module, if the output voltage of the variable frequency power supply is higher, the switch S is switched off, so that the current is rapidly reduced, the similarity between the current waveform and the sine wave is greatly improved, and the waveform distortion is reduced. Therefore, in this embodiment, the voltage regulator is beneficial to improving the power factor Q of the resonant module and reducing the harmonic current, so that the effective value of the main loop current I is obviously reduced under the same power, and the requirements on the current capacity of devices such as circuits and switches are reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power supply apparatus with adjustable capacity, comprising: variable frequency power supply, transformer, voltage regulation module, resonance module, signal acquisition module and industrial computer, variable frequency power supply connects primary winding, external power source of transformer, with the industrial computer, the secondary winding of transformer is connected the voltage regulation module, the voltage regulation module is connected the resonance module with the industrial computer, the distribution transformer that awaits measuring is connected to the resonance module, signal acquisition module connects the resonance module with the industrial computer is used for acquireing the output voltage of resonance module with distribution transformer's that awaits measuring supply voltage's difference and send to the industrial computer, the industrial computer is used for adjusting the input voltage frequency and the amplitude of resonance module make the difference satisfies the threshold value requirement.
2. The power supply equipment with the adjustable capacity of claim 1, wherein the voltage regulating module comprises a rectifying circuit, a capacitor and a variable resistor, the input side of the rectifying circuit is connected with the secondary winding of the transformer, the capacitor is connected in parallel with the output side of the rectifying circuit, the output side of the rectifying circuit is also connected with the first end and the second end of the variable resistor, the regulating end of the variable resistor is used as the positive electrode of the output side of the voltage regulating module, the positive electrode of the output side is connected with the industrial personal computer, and the second end of the variable resistor is used as the negative electrode of the output side of the voltage regulating module.
3. The power supply equipment with the adjustable capacity of claim 2, wherein the resonance module comprises an equivalent resistor, a series reactor, a shunt reactor and a voltage divider, one end of the equivalent resistor is connected with the output side anode of the voltage regulating module, the other end of the equivalent resistor is connected with one end of the series reactor, the other end of the series reactor is connected with one end of the shunt reactor and the voltage divider, the other end of the shunt reactor is connected with the output side cathode of the voltage regulating module and the voltage divider, and the voltage divider is connected with the signal acquisition module and the distribution transformer to be tested.
4. The power supply equipment with the adjustable capacity of claim 3, wherein the signal acquisition module comprises a voltage acquisition circuit, a difference value output circuit and a digital-to-analog conversion circuit, the voltage acquisition circuit is connected with the voltage divider and the difference value output circuit, the difference value output circuit is connected with the digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is connected with the industrial personal computer.
5. The power supply equipment with the adjustable capacity of claim 1, further comprising a display module, wherein the display module is connected with the industrial personal computer.
6. The power supply equipment with the adjustable capacity of claim 5, wherein the signal acquisition module is connected with the resonance module through an optical fiber, and the industrial personal computer is connected with the display module through an optical fiber.
7. The power supply equipment with the adjustable capacity of claim 1, further comprising an auxiliary power supply, wherein the auxiliary power supply is connected with the external power supply, the industrial personal computer and the signal acquisition module.
8. The power supply equipment with the adjustable capacity of claim 1, further comprising a power supply protection device and an equipment protection device, wherein the external power supply is connected with the variable frequency power supply through the power supply protection device, and the resonance module is connected with the distribution transformer to be tested through the equipment protection device.
9. The power supply equipment with the adjustable capacity of any one of claims 1 to 8, further comprising a voltage stabilizing device, wherein the variable frequency power supply is connected with the transformer through the voltage stabilizing device.
10. The power supply equipment with the adjustable capacity of any one of claims 1 to 8, wherein the variable frequency power supply is a high-voltage digital power supply.
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| CN202110609862.4A CN113394987B (en) | 2021-06-01 | 2021-06-01 | Capacity-adjustable power supply equipment |
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| CN202110609862.4A CN113394987B (en) | 2021-06-01 | 2021-06-01 | Capacity-adjustable power supply equipment |
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| US20060285366A1 (en) * | 2005-05-23 | 2006-12-21 | Matthias Radecker | Control circuit for a switch unit of a clocked power supply circuit, and resonance converter |
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| CN113394987B (en) | 2023-01-20 |
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